testsuite/100272 - fix some malformed dg directives

The bug points out several malformed dg directives, the following
fixes the obvious ones where the testcases keep working after the
change.

2021-04-27  Richard Biener  <rguenther@suse.de>

	PR testsuite/100272
	* g++.dg/diagnostic/ptrtomem1.C: Fix dg directives.
	* g++.dg/ipa/pr45572-2.C: Likewise.
	* g++.dg/template/spec26.C: Likewise.
	* gcc.dg/pr20126.c: Likewise.
	* gcc.dg/tree-ssa/pr20739.c: Likewise.

gcc/testsuite/g++.dg/diagnostic/ptrtomem1.C

@@ -19,7 +19,7 @@ void f2(T)
 { }
 
 template<typename T>
-requires (sizeof(T)==1) // dg-message {\[with T = int \(X::\*\)\[5\]\]} }
+requires (sizeof(T)==1) // { dg-message {\[with T = int \(X::\*\)\[5\]\]} }
 void f3(T)
 { }
 

gcc/testsuite/g++.dg/ipa/pr45572-2.C

@@ -1,5 +1,5 @@
 // { dg-do compile }
-// { dg-options "-finline-small-functions -findirect-inlining -finline-function+
+// { dg-options "-finline-small-functions -findirect-inlining -finline-functions -O" }
 typedef struct
 {} __mpf_struct;
 typedef __mpf_struct mpf_t[1];

gcc/testsuite/g++.dg/template/spec26.C

@@ -1,4 +1,4 @@
-// dg-do run
+// { dg-do run }
 // Copyright (C) 2005 Free Software Foundation, Inc.
 // Contributed by Nathan Sidwell 16 Sep 2005 <nathan@codesourcery.com>
 

gcc/testsuite/gcc.dg/pr20126.c

@@ -1,5 +1,5 @@
-/* dg-do run */
-/* dg-options "-O2" */
+/* { dg-do run } */
+/* { dg-options "-O2" } */
 
 /* PR target/20126 was not really target-specific, but rather a loop's
    failure to take into account the possibility that a DEST_ADDR giv

gcc/testsuite/gcc.dg/tree-ssa/pr20739.c

@@ -1,7 +1,7 @@
 /* PR middle-end/20739 */
 
-/* dg-do compile */
-/* dg-options "-O" */
+/* { dg-do compile } */
+/* { dg-options "-O" } */
 
 /* We used to fail to compile this because gimplification dropped the
    conversion that added the const qualifier to the sub-expression