[clang] [Driver][RISCV] Add the riscv*-redhat-linux triples (PR #228450)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Tulio Magno Quites Machado Filho (tuliom)

<details>
<summary>Changes</summary>

Add the redhat vendor triples for riscv*.

This is particularly important when running tests because there is no way to set compiler flags that are inherited by tests.

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Full diff: https://github.com/llvm/llvm-project/pull/228450.diff


1 Files Affected:

- (modified) clang/lib/Driver/ToolChains/Gnu.cpp (+4-2) 


``````````diff
diff --git a/clang/lib/Driver/ToolChains/Gnu.cpp b/clang/lib/Driver/ToolChains/Gnu.cpp
index 7591d9f7fa418..90fc71c147364 100644
--- a/clang/lib/Driver/ToolChains/Gnu.cpp
+++ b/clang/lib/Driver/ToolChains/Gnu.cpp
@@ -2456,10 +2456,12 @@ void Generic_GCC::GCCInstallationDetector::AddDefaultGCCPrefixes(
 
   static const char *const RISCV32LibDirs[] = {"/lib32", "/lib"};
   static const char *const RISCV32Triples[] = {"riscv32-unknown-linux-gnu",
-                                               "riscv32-unknown-elf"};
+                                               "riscv32-unknown-elf",
+                                               "riscv32-redhat-linux"};
   static const char *const RISCV64LibDirs[] = {"/lib64", "/lib"};
   static const char *const RISCV64Triples[] = {"riscv64-unknown-linux-gnu",
-                                               "riscv64-unknown-elf"};
+                                               "riscv64-unknown-elf",
+                                               "riscv64-redhat-linux"};
 
   static const char *const RISCV32beLibDirs[] = {"/lib32", "/lib"};
   static const char *const RISCV32beTriples[] = {"riscv32be-unknown-linux-gnu",

``````````

</details>


https://github.com/llvm/llvm-project/pull/228450