20240723 Amazon Linux 2023: find the resource dir when using ...

...default triple instead of the vendor one.

This matches the behaviour of clang and clang18 that ships as part of
the distribution.

Resolves swiftlang/swift#84363

(cherry picked from commit 20cf541)

Author: edymtt

clang/lib/Driver/ToolChains/Gnu.cpp

@@ -2464,7 +2464,7 @@ void Generic_GCC::GCCInstallationDetector::AddDefaultGCCPrefixes(
   static const char *const AArch64LibDirs[] = {"/lib64", "/lib"};
   static const char *const AArch64Triples[] = {
       "aarch64-none-linux-gnu", "aarch64-linux-gnu", "aarch64-redhat-linux",
-      "aarch64-suse-linux"};
+      "aarch64-suse-linux", "aarch64-amazon-linux"};
   static const char *const AArch64beLibDirs[] = {"/lib"};
   static const char *const AArch64beTriples[] = {"aarch64_be-none-linux-gnu"};