PPC64LE: Fix the cache clear instructions.

Change the cache clear instructions for generated PPC64LE code so that it uses
an input variable instead of an output variable.

With an output variable, it doesn't use the correct address for the dcbst and
icbi instructions, possibly causing it to crash.

src/GLdispatch/vnd-glapi/entry_ppc64le_tls.c

@@ -162,7 +162,7 @@ void entry_generate_default_code(char *entry, int slot)
                          "  sync\n\t"
                          "  icbi 0, %0\n\t"
                          "  isync\n"
-                         : "=r" (writeEntry)
+                         : : "r" (writeEntry)
                      );
 }
 

src/GLdispatch/vnd-glapi/entry_ppc64le_tsd.c

@@ -210,7 +210,7 @@ void entry_generate_default_code(char *entry, int slot)
                          "  sync\n\t"
                          "  icbi 0, %0\n\t"
                          "  isync\n"
-                         : "=r" (writeEntry)
+                         : : "r" (writeEntry)
                      );
 }
 

src/util/glvnd_genentry.c

@@ -327,7 +327,7 @@ void SetDispatchFuncPointer(GLVNDGenEntrypoint *entry,
                          "  sync\n\t"
                          "  icbi 0, %0\n\t"
                          "  isync\n"
-                         : "=r" (code)
+                         : : "r" (code)
                      );
 #else
 #error "Can't happen -- not implemented"

tests/dummy/patchentrypoints.c

@@ -204,7 +204,7 @@ static void patch_ppc64le(char *writeEntry, const char *execEntry,
                          "  sync\n\t"
                          "  icbi 0, %0\n\t"
                          "  isync\n"
-                         : "=r" (writeEntry)
+                         : : "r" (writeEntry)
                      );
 #else
     assert(0); // Should not be calling this