[clang] [clang dependency scanning] Make Current Working Directory Optimization Off by Default (PR #129809)

[Qiongsi Wu via cfe-commits]

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@@ -67,7 +67,7 @@ enum class ScanningOptimizations {
   IgnoreCWD = (1 << 4),
 
   DSS_LAST_BITMASK_ENUM(IgnoreCWD),
-  Default = All
+  Default = All & (~IgnoreCWD)
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qiongsiwu wrote:

Comments added. 

https://github.com/llvm/llvm-project/pull/129809