[clang] [Clang][Solaris] Support --ld-path in Solaris driver (PR #163000)

[Fangrui Song via cfe-commits]

================
@@ -46,6 +47,34 @@ class LLVM_LIBRARY_VISIBILITY Linker final : public Tool {
                     const llvm::opt::ArgList &TCArgs,
                     const char *LinkingOutput) const override;
 };
+
+enum class LinkerExpectations {
----------------
MaskRay wrote:

This enum class looks over engineered. We probably just need boolean variables `IsSolarisLd` in call sites

https://github.com/llvm/llvm-project/pull/163000