caches: add LLVM_DEFAULT_TARGET_TRIPLE to Windows-x86_64

Add the default target triple to match the target for the Windows
toolchain.  This avoids the need for an additional parameter, and
it makes sense for the target to be the host by default. Explicit
parameters can change the target when desired.

Author: compnerd

cmake/caches/Windows-x86_64.cmake

@@ -20,6 +20,10 @@ set(LLVM_ENABLE_ASSERTIONS YES CACHE BOOL "")
 
 set(ENABLE_X86_RELAX_RELOCATIONS YES CACHE BOOL "")
 
+# NOTE(compnerd) we can hardcode the default target triple since the cache files
+# are target dependent.
+set(LLVM_DEFAULT_TARGET_TRIPLE x86_64-unknown-windows-msvc CACHE STRING "")
+
 set(LLVM_APPEND_VC_REV NO CACHE BOOL "")
 set(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR YES CACHE BOOL "")
 set(LLVM_ENABLE_PYTHON YES CACHE BOOL "")
@@ -39,6 +43,7 @@ foreach(target ${LLVM_RUNTIME_TARGETS})
   set(RUNTIMES_${target}_COMPILER_RT_BUILD_SANITIZERS NO CACHE BOOL "")
   set(RUNTIMES_${target}_COMPILER_RT_BUILD_XRAY NO CACHE BOOL "")
 endforeach()
+
 set(LLVM_TARGETS_TO_BUILD AArch64 ARM WebAssembly X86 CACHE STRING "")
 
 # Disable certain targets to reduce the configure time or to avoid configuration