compiler_wrapper: redirect clang crash dignoses

Redirect all diagnoses of clang crashes to a dedicated directory using
fcrash-diagnostics-dir so we can upload these files to the cloud. The
flag was added to clangPostFlags to overwite redirection done on package
level.

BUG=chromium:1056904

TEST=None

Change-Id: I78bfc77d7f3af8556b4308f2e71407d627627747
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/2251038
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Commit-Queue: Jian Cai <jiancai@google.com>
Tested-by: Jian Cai <jiancai@google.com>
diff --git a/compiler_wrapper/config.go b/compiler_wrapper/config.go
index 3c3668d..b11c680 100644
--- a/compiler_wrapper/config.go
+++ b/compiler_wrapper/config.go
@@ -134,6 +134,7 @@
 		"-fuse-ld=lld",
 		"-Wno-final-dtor-non-final-class",
 		"-Werror=poison-system-directories",
+		"-fcrash-diagnostics-dir=/tmp/clang_crash_diagnostics",
 	},
 	clangPostFlags: []string{
 		"-Wno-implicit-int-float-conversion",
@@ -164,6 +165,7 @@
 		"-static-libgcc",
 		"-Wno-final-dtor-non-final-class",
 		"-Werror=poison-system-directories",
+		"-fcrash-diagnostics-dir=/tmp/clang_crash_diagnostics",
 	},
 	clangPostFlags: []string{
 		"-Wno-implicit-int-float-conversion",
@@ -199,6 +201,7 @@
 		"-Wno-final-dtor-non-final-class",
 		"-Werror=poison-system-directories",
 		"-Wno-unknown-warning-option",
+		"-fcrash-diagnostics-dir=/tmp/clang_crash_diagnostics",
 	},
 	clangPostFlags: []string{
 		"-Wno-implicit-int-float-conversion",