c++: Update mangling of lambdas in expressions

itanium-cxx-abi/cxx-abi#85 clarifies that
mangling a lambda expression should use 'L' rather than "tl".

gcc/cp/ChangeLog:

	* mangle.cc (write_expression): Update mangling for lambdas.

gcc/testsuite/ChangeLog:

	* g++.dg/cpp2a/lambda-generic-mangle1.C: Update mangling.
	* g++.dg/cpp2a/lambda-generic-mangle1a.C: Likewise.

Signed-off-by: Nathaniel Shead <[email protected]>

Author: wreien

gcc/cp/mangle.cc

@@ -3799,7 +3799,7 @@ write_expression (tree expr)
 	 equivalent.
 
 	 So just use the closure type mangling.  */
-      write_string ("tl");
+      write_char ('L');
       write_type (LAMBDA_EXPR_CLOSURE (expr));
       write_char ('E');
     }

gcc/testsuite/g++.dg/cpp2a/lambda-generic-mangle1.C

@@ -6,4 +6,4 @@ struct C {
   void f(decltype([](T, auto) { return 0; })) {}
 };
 void g() { C().f<int>({}); }
-// { dg-final { scan-assembler "_ZN1C1fIiEEvDTtlNS_UlT_TL0__E_EEE" } }
+// { dg-final { scan-assembler "_ZN1C1fIiEEvDTLNS_UlT_TL0__E_EEE" } }

gcc/testsuite/g++.dg/cpp2a/lambda-generic-mangle1a.C

@@ -7,4 +7,4 @@ struct C {
   void f(decltype([](T, auto) { return 0; })) {}
 };
 void g() { C().f<int>({}); }
-// { dg-final { scan-assembler "_ZN1C1fIiEEvDTtlNS_UlT_T_E_EEE" } }
+// { dg-final { scan-assembler "_ZN1C1fIiEEvDTLNS_UlT_T_E_EEE" } }