github: Add ARC, CSKY and Lanai PR labeler paths (llvm#139063)

Author: arsenm

.github/new-prs-labeler.yml

@@ -791,6 +791,12 @@ lld:wasm:
   - lld/**/wasm/**
   - lld/Common/**
 
+backend:ARC:
+  - llvm/lib/Target/ARC/**
+  - clang/lib/Basic/Targets/ARC.h
+  - clang/lib/Basic/Targets/ARC.cpp
+  - clang/lib/CodeGen/Targets/ARC.cpp
+
 backend:ARM:
   - llvm/include/llvm/IR/IntrinsicsARM.td
   - llvm/test/MC/ARM/**
@@ -817,6 +823,19 @@ backend:AArch64:
   - clang/include/clang/Sema/SemaARM.h
   - clang/lib/Sema/SemaARM.cpp
 
+backend:CSKY:
+  - llvm/lib/Target/CSKY/**
+  - llvm/include/llvm/TargetParser/CSKYTargetParser.def
+  - llvm/include/llvm/TargetParser/CSKYTargetParser.h
+  - llvm/include/llvm/BinaryFormat/ELFRelocs/CSKY.def
+  - llvm/lib/TargetParser/CSKYTargetParser.cpp
+  - llvm/lib/Support/CSKYAttributes.cpp
+  - llvm/lib/Support/CSKYAttributeParser.cpp
+  - clang/lib/Basic/Targets/CSKY.h
+  - clang/lib/Basic/Targets/CSKY.cpp
+  - clang/lib/CodeGen/Targets/CSKY.cpp
+  - clang/lib/Driver/ToolChains/CSKY*
+
 backend:Hexagon:
   - clang/include/clang/Basic/BuiltinsHexagon*.def
   - clang/include/clang/Sema/SemaHexagon.h
@@ -840,6 +859,13 @@ backend:Hexagon:
   - llvm/test/MC/Hexagon/**
   - llvm/test/tools/llvm-objdump/ELF/Hexagon/**
 
+backend:Lanai:
+  - llvm/lib/Target/Lanai/**
+  - clang/lib/Basic/Targets/Lanai.h
+  - clang/lib/Basic/Targets/Lanai.cpp
+  - clang/lib/CodeGen/Targets/Lanai.cpp
+  - clang/lib/Driver/ToolChains/Lanai*
+
 backend:loongarch:
   - llvm/include/llvm/IR/IntrinsicsLoongArch.td
   - llvm/test/MC/LoongArch/**