[clang] [llvm] [clang][Hexagon] Add Picolibc as part of triple (PR #169613)

[Petr Hosek via llvm-commits]

================
@@ -311,6 +311,7 @@ class Triple {
     OpenCL,
     OpenHOS,
     Mlibc,
+    Picolibc,
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petrhosek wrote:

This section is for shader stages, `Picolibc` should go next to other ABI/libc after `LLVM` on line 282.

https://github.com/llvm/llvm-project/pull/169613