Also teaches FML to create files and directories.

…rkload. (#6350)

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* Fix a compilation problem when  using iPhoneOS12.0sdk(Xcode10).

Includes the following changes:
808ed62 [vm, compiler] Make register allocator instead of assembler put the write barrier value into a fixed register.
2f25dcd [vm] Remove script snapshots.
5d10974 [vm/bytecode] Use _simpleInstanceOf for certain 'is' checks in bytecode
9cc251c [vm/test] Fix process_stderr_test.
0f59689 [vm/aot] Do not tree shake type arguments used in constant instances
99daccc Handle FunctionExpressionInvocation when creating summaries.
d673847 [dartdevc] add --kernel option, deprecate bin/dartdevk
79d639a [VM interpreter/bytecode] Modify argument order for AssertAssignable bytecode.
9fb3ff1 Extract InheritanceManager2.
d9fb4b0 [vm/compiler] Fix recent regressions due to inaccurate type merging
dcad8fe In analyzer/FE comparison, compare the return types of function types.
3c4c62d Reland "[VM] Dart_Initialize no longer crashes after Dart_Cleanup"
e31f9fc Track front end errors.
15c64b4 [vm/aot] Remove 'rounds' from precompiler
e7d71be [toolchain] Update Windows VS toolchain to current Chromium one.
0262530 Clarify code that checks for analyzer/FE differences.
5940ba2 [benchmark] Add gen_kernel_bytecode.dill to try_benchmarks.sh
bbfd402 Fix copyright date in new test
4dcd839 Allow super invocations find members in supertypes of old style mixins.
a0ff5f8 Add stub implementation for analysis server edit.dartfix
0808d29 Update spec of potentially constant and compile-time constant expressions.
d8c32ae [vm] Add a reload test that checks that types are finalized.
cf055d6 [vm] Fix isolate reload tests so that they can pass kernel files for isolate reload.
429bca8 Make `Uri.parse` accept `[` and `]` in path, query and fragment.
b01f461 Add product mode macos dart executable to fileset for running tests
e05f1fc Adjusted superclasses to make a mixin application superclass abstract
b480089 Fix updateExpectations in expression test
4816b60 Eliminate checked mode and production mode
c22b2ef Verify that mixin constraints can't be satisfied by the application (or named class) itself.
98a9adf Make constructor function types conform with the specification.
a3aa0c1 Improve messages involving empty cycles
48d1b5e Improve diagnostics with anonymous jump targets
c38eab4 [infra] Remove Dart 1 builders from the CQ (Part II)
e17a596 [gardening] Update product dartk test status.
efe76b2 [gardening] Update product dartk test status.
1a29217 Remove empty statements
1c8d65c fix #32785, implement typedef equality in dartdevc
20fa781 Add @pragma('dart2js:noInline') and @pragma('dart2js:tryInline')
b1a5415 Check that implicit type arguments satisfy bounds.
3b511b9 [dartdevc] improve compile time of kernel backend
c7383b5 Revert "[VM runtime] Store Smi instance type in type test cache when using the interpreter."
d1a3eaa Add flag to control symbol visibility of libdart
86430cb [vm] Extend AppJIT capability of gen_snapshot.
f81709c [vm/aot] Use field types inferred in TFA and remove inference in precompiler.cc
e7fc155 [gardening] Adjust product kernel test status
b3b947d bump to linter 0.1.64
c9bcfe8 [vm] Fix byte displacement printing in x86 disassembler
ded73cd Revert "[dart2js] Simplify noInline / tryInline annotations"
2c82a40 Signal a static error when invoking a non-function (issue 34320)
34425a8 [vm] Set implicit function accessor when the functions are created
8bae3a1 [dart2js] Simplify noInline / tryInline annotations
8ff692a [infra] Remove Dart 1 builders from the CQ (Part I)
9185294 Reland: Implement inheritance/override checks from the spec.
c23a981 Stop setting element model supertypes in TypeResolverVisitor when using new driver.
17b3310 Resolve bounds for type parameters of generic type alias.
c624f8b First cut dartfix protocol

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* SystemNavigator.pop can pop w/o UINavigationController

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So tool_tests-windows won't fail.

For flutter/flutter#21619 (comment)

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