[lld] [llvm] [LLD][COFF] Prefetch inputs early-on to improve link times (PR #169224)

[Saleem Abdulrasool via llvm-commits]

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@@ -1023,6 +1023,32 @@ void mapped_file_region::unmapImpl() {
 
 void mapped_file_region::dontNeedImpl() {}
 
+void mapped_file_region::willNeedImpl() {
+#if (_WIN32_WINNT < _WIN32_WINNT_WIN8)
+  typedef struct _WIN32_MEMORY_RANGE_ENTRY {
+    PVOID VirtualAddress;
+    SIZE_T NumberOfBytes;
+  } WIN32_MEMORY_RANGE_ENTRY, *PWIN32_MEMORY_RANGE_ENTRY;
+#endif
+
+  HMODULE kernelM = llvm::sys::windows::loadSystemModuleSecure(L"kernel32.dll");
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compnerd wrote:

This is where the version is likely more useful. In the case of the minimum deployment version being >7, we should prefer static linking IMO. But, I know that is more challenging and potentially not as valuable to invest in, so more of a passing comment.

https://github.com/llvm/llvm-project/pull/169224