Revert concepts changes from D41910

These changes caused LibcxxVariantDataFormatterTestCase in lldb to fail
with an assert:

Assertion failed: (Idx < size() && "Out-of-bounds Bit access."),
function operator[], file
/Users/buildslave/jenkins/workspace/lldb-cmake/llvm-project/llvm/include/llvm/ADT/SmallBitVector.h,
line 452.

In:

7  clang-10                 0x00000001094b79d9 isAtLeastAsSpecializedAs(clang::Sema&, clang::SourceLocation, clang::FunctionTemplateDecl*, clang::FunctionTemplateDecl*, clang::TemplatePartialOrderingContext, unsigned int) + 1865
8  clang-10                 0x00000001094b7111 clang::Sema::getMoreSpecializedTemplate(clang::FunctionTemplateDecl*, clang::FunctionTemplateDecl*, clang::SourceLocation, clang::TemplatePartialOrderingContext, unsigned int, unsigned int) + 97
9  clang-10                 0x000000010939bf88 clang::isBetterOverloadCandidate(clang::Sema&, clang::OverloadCandidate const&, clang::OverloadCandidate const&, clang::SourceLocation, clang::OverloadCandidateSet::CandidateSetKind) + 1128

Revert "[Concepts] Fix incorrect move out of temporary in D41910"

This reverts commit 11d5fa6e87e3584f72056ecc2b17f88c58323dde.

Revert "[Concepts] Fix crash in D41910"

This reverts commit 12038be20ee6a903cdbd3fddce65535ef683e31d.

Revert "[Concepts] Constrained partial specializations and function overloads."

This reverts commit fc0731b98a67c793862288f8ae334322666214dc.

1 files changed, 0 insertions, 4 deletions

diff --git a/clang/lib/Frontend/FrontendActions.cpp b/clang/lib/Frontend/FrontendActions.cpp
index cbcaf2f96d5..aeea63ca323 100644
--- a/clang/lib/Frontend/FrontendActions.cpp
+++ b/clang/lib/Frontend/FrontendActions.cpp
@@ -425,10 +425,6 @@ private:
       return "ConstraintsCheck";
     case CodeSynthesisContext::ConstraintSubstitution:
       return "ConstraintSubstitution";
-    case CodeSynthesisContext::ConstraintNormalization:
-      return "ConstraintNormalization";
-    case CodeSynthesisContext::ParameterMappingSubstitution:
-      return "ParameterMappingSubstitution";
     }
     return "";
   }