[clang] [Clang] Defer the instantiation of explicit-specifier until constraint checking completes (PR #70548)

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``````````bash
git-clang-format --diff 39b939555f959b93061b3c4c8fffc13a63737074 991212294aefaff304610213baaee927634a6c55 -- clang/test/SemaCXX/cxx2a-explicit-bool-deferred.cpp clang/include/clang/Sema/Sema.h clang/lib/Sema/SemaTemplateDeduction.cpp clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
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View the diff from clang-format here.
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diff --git a/clang/lib/Sema/SemaTemplateDeduction.cpp b/clang/lib/Sema/SemaTemplateDeduction.cpp
index a1f43e213f81..76f3c1f19fc4 100644
--- a/clang/lib/Sema/SemaTemplateDeduction.cpp
+++ b/clang/lib/Sema/SemaTemplateDeduction.cpp
@@ -3556,8 +3556,7 @@ static unsigned getPackIndexForParam(Sema &S,
 // if `Specialization` is a `CXXConstructorDecl` or `CXXConversionDecl`,
 // we'll try to instantiate and update its explicit specifier after constraint
 // checking.
-static Sema::TemplateDeductionResult
-instantiateExplicitSpecifierDeferred(
+static Sema::TemplateDeductionResult instantiateExplicitSpecifierDeferred(
     Sema &S, FunctionDecl *Specialization,
     const MultiLevelTemplateArgumentList &SubstArgs,
     TemplateDeductionInfo &Info, FunctionTemplateDecl *FunctionTemplate,

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https://github.com/llvm/llvm-project/pull/70548