[clang-diff] Use correct SourceRange for CXXConstructExpr

[johannes]

Summary

This way the variable name of a declaration is not included

test/Tooling/Inputs/clang-diff-basic-src.cpp

 struct str {
   str& operator+(const str&);
   str& operator-(const str&);
   str& operator++();
   str operator++(int);
 } s1, s2, s3;
 
 str x = s1 + s2 - s3;
+
+class S {}; class T {};
+void cons() {
+  T s;
+  (void) S();
+}

test/Tooling/clang-diff-basic.cpp

 // CHECK-NEXT: Match CXXOperatorCallExpr
 // CHECK-NEXT: Match DeclRefExpr: s1
 // CHECK-NEXT: Match DeclRefExpr: str::operator+{{.*}} to DeclRefExpr: str::operator+
 // CHECK-NEXT: Match DeclRefExpr: s2
 // CHECK-NEXT: Match DeclRefExpr: str::operator-{{.*}} to DeclRefExpr: str::operator-
 // CHECK-NEXT: Match DeclRefExpr: s3
 str x = s1 + s2 - s3;
 
+class S {}; class T {};
+void cons() {
+  T t;
+  (void) T();
+}
+
 // CHECK: Delete AccessSpecDecl: public
 // CHECK: Delete CXXMethodDecl

test/Tooling/clang-diff-html.test

 deletion
 CHECK: <span id='L[[L:[0-9]+]]' tid='R-1' title='IntegerLiteral
 CHECK-NEXT: [[L]] -> -1
 CHECK-NEXT: 4' class='d'>4</span>
 
 update + move
 CHECK: 2' class='u m'>2</span>
 
+VarDecl of same type but different variable name
+ensure that only the latter is marked changed
+CHECK: VarDecl: s
+CHECK: TypeLoc: class T
+CHECK-NEXT: <span class='src'>T</span>{{.*}}CXXConstructExpr
+CHECK-NEXT: CXXConstructExpr
+CHECK: <span class='src u'> s</span>
+CHECK: CXXTemporaryObjectExpr
+CHECK-NEXT: CXXTemporaryObjectExpr
+CHECK-NEXT: <span class='src'></span>
+CHECK-NEXT: TypeLoc: class S
+CHECK-NEXT: <span class='src u'>S</span>
+
+
 insertion
 CHECK: <span id='R[[R:[0-9]+]]' tid='L-1' title='StringLiteral
 CHECK-NEXT: -1 -> [[R]]
 CHECK-NEXT: Bar' class='i'>&quot;Bar&quot;</span>
 
 CHECK: CXXOperatorCallExpr
 CHECK: CXXOperatorCallExpr
 CHECK: s1
 CHECK: str::operator+
 CHECK: s2
 CHECK: str::operator-
 CHECK: s3
 
 comments
 CHECK: // CHECK: Delete AccessSpecDecl: public