[compiler-rt] Fix amdgcn -> amdgpu conversion for compiler-rt (#209765)

Summary:
We are apparently transitioning to using `amdgpu` everywhere, so these
need to be updated.

Author: jhuber6

compiler-rt/cmake/Modules/AllSupportedArchDefs.cmake

@@ -1,5 +1,5 @@
 set(ALPHA alpha)
-set(AMDGPU amdgcn)
+set(AMDGPU amdgcn amdgpu)
 set(ARM64 aarch64)
 set(ARM32 arm armhf)
 set(HEXAGON hexagon)

compiler-rt/cmake/Modules/CompilerRTUtils.cmake

@@ -170,7 +170,7 @@ macro(detect_target_arch)
   check_symbol_exists(__wasm64__ "" __WEBASSEMBLY64)
   check_symbol_exists(__ve__ "" __VE)
   if(__AMDGPU)
-    add_default_target_arch(amdgcn)
+    add_default_target_arch(amdgpu)
   elseif(__ARM)
     add_default_target_arch(arm)
   elseif(__AVR)

compiler-rt/cmake/base-config-ix.cmake

@@ -250,7 +250,7 @@ macro(test_targets)
         endif()
       endif()
     elseif(COMPILER_RT_TARGET_AMDGPU)
-      test_target_arch(amdgcn "" "--target=amdgcn-amd-amdhsa" "-nogpulib"
+      test_target_arch(amdgpu "" "--target=amdgpu-amd-amdhsa" "-nogpulib"
                        "-flto" "-Xclang -mcode-object-version=none")
     elseif("${COMPILER_RT_DEFAULT_TARGET_ARCH}" MATCHES "hexagon")
       test_target_arch(hexagon "" "")

compiler-rt/cmake/builtin-config-ix.cmake

@@ -77,7 +77,7 @@ else()
   set(OS_NAME "${CMAKE_SYSTEM_NAME}")
 endif()
 
-set(AMDGPU amdgcn)
+set(AMDGPU amdgcn amdgpu)
 set(ARM64 aarch64 arm64ec aarch64_lfi)
 set(ARM32 arm armhf armv4t armv5te armv6 armv6m armv7m armv7em armv7 armv7s armv7k armv8m.base armv8m.main armv8.1m.main)
 set(AVR avr)

compiler-rt/lib/builtins/CMakeLists.txt

@@ -832,6 +832,7 @@ if (APPLE)
 endif()
 
 set(amdgcn_SOURCES ${GENERIC_SOURCES})
+set(amdgpu_SOURCES ${GENERIC_SOURCES})
 
 set(armv4t_SOURCES ${arm_min_SOURCES})
 set(armv5te_SOURCES ${arm_min_SOURCES})