[Regression] Fuchsia build times nearly doubled since clang role #177356
Description
Fuchsia builds went from average 22 minutes to 45 minutes. Looking at the rbe metrics, there's a high ratio of compilation happening locally.
W1020 12:00:58.390799 97010 server.go:696] eb85634e-f7bb-443f-b077-8be705d19620: Remote execution failed with &{ExitCode:1 Status:NonZeroExitResultStatus Err:<nil>}, falling back to local.
stdout: In file included from ../../../flutter/third_party/boringssl/src/crypto/cipher/e_tls.cc:17:
In file included from ../../../flutter/buildtools/linux-x64/clang/bin/../include/c++/v1/string.h:57:
�[1m../../../flutter/buildtools/linux-x64/clang/bin/../include/c++/v1/__config:13:10: �[0m�[0;1;31mfatal error: �[0m�[1m'__config_site' file not found�[0m
13 | #include <__config_site>�[0m
| �[0;1;32m ^~~~~~~~~~~~~~~
�[0m1 error generated.