Reland #79707

Revert "Merge pull request #80767 from meg-gupta/reverttransparent"

This reverts commit 198a802719, reversing
changes made to 8eb43af590.

lib/SILOptimizer/Mandatory/OSLogOptimization.cpp

@@ -938,6 +938,16 @@ static void substituteConstants(FoldState &foldState) {
   for (SILValue constantSILValue : foldState.getConstantSILValues()) {
     SymbolicValue constantSymbolicVal =
         evaluator.lookupConstValue(constantSILValue).value();
+    CanType instType = constantSILValue->getType().getASTType();
+
+    // If the SymbolicValue is a string but the instruction that is folded is
+    // not String typed, we are tracking a StaticString which is represented as
+    // a raw pointer. Skip folding StaticString as they are already efficiently
+    // represented.
+    if (constantSymbolicVal.getKind() == SymbolicValue::String &&
+        !instType->isString())
+      continue;
+
     // Make sure that the symbolic value tracked in the foldState is a constant.
     // In the case of ArraySymbolicValue, the array storage could be a non-constant
     // if some instruction in the array initialization sequence was not evaluated
@@ -976,7 +986,6 @@ static void substituteConstants(FoldState &foldState) {
 
     SILBuilderWithScope builder(insertionPoint);
     SILLocation loc = insertionPoint->getLoc();
-    CanType instType = constantSILValue->getType().getASTType();
     SILValue foldedSILVal = emitCodeForSymbolicValue(
         constantSymbolicVal, instType, builder, loc, foldState.stringInfo);