ParseTestSpecification: handle multi-line strings

We need this for specifications that involve multiple components and long instruction lists.

Author: atrick

lib/SIL/Parser/ParseSIL.cpp

@@ -3638,7 +3638,9 @@ bool SILParser::parseSpecificSILInstruction(SILBuilder &B,
       return true;
     }
     // Drop the double quotes.
-    auto ArgumentsSpecification = P.Tok.getText().drop_front().drop_back();
+    unsigned numQuotes = P.Tok.isMultilineString() ? 4 : 1;
+    auto ArgumentsSpecification =
+      P.Tok.getText().drop_front(numQuotes).drop_back(numQuotes).trim();
     P.consumeToken(tok::string_literal);
     ResultVal = B.createTestSpecificationInst(InstLoc, ArgumentsSpecification);
     break;

lib/SILOptimizer/UtilityPasses/ParseTestSpecification.cpp

@@ -568,7 +568,10 @@ class ParseTestSpecification {
     specificationString.split(components, " ");
     for (unsigned long index = 0, size = components.size(); index < size;
          ++index) {
-      auto componentString = components[index];
+      auto componentString = components[index].trim();
+      if (componentString.empty())
+        continue;
+
       ParseArgumentSpecification parser(*this, componentString,
                                         specification.context);
       auto argument = parser.parse();

lib/SILOptimizer/UtilityPasses/UnitTestRunner.cpp

@@ -124,7 +124,11 @@ class UnitTestRunner : public SILFunctionTransform {
                  << name << " with: ";
     for (unsigned long index = 0, size = components.size(); index < size;
          ++index) {
-      llvm::errs() << components[index];
+      auto componentString = components[index].trim();
+      if (componentString.empty())
+        continue;
+
+      llvm::errs() << componentString;
       if (index != size - 1) {
         llvm::errs() << ", ";
       }