Fixed timing of #pragma charmap.

Now it is immediately applied and affects almost all characters and string literals after it.
Exceptions:
- String literals as the message of a static assertion or inline assembler code (only the required one, not any optional formatted arguments) in an asm() expression are not translated with either #pragma charmap or target presets.
- String literals used for preprocessor directives or as the result of stringized macro arguments are never translated.

test/val/bug2151.c

@@ -1,9 +1,39 @@
 /* Bug #2151 - #pragma causes errors when used within functions */
 
+#include <stdio.h>
+#include <string.h>
+
+#pragma charmap(0x61, 0x61)
+_Static_assert('A'==
+#pragma charmap(0x61, 0x41)
+'a'
+#pragma charmap(0x61, 0x42)
+,
+#pragma charmap(0x61, 0x61)
+"charmap failed");
+
+char str[] =
+"a"
+#pragma charmap(0x61, 0x42)
+"a"
+#pragma charmap(0x61, 0x43)
+"a"
+#pragma charmap(0x61, 0x61)
+;
+
+unsigned failures;
+
 #pragma bss-name("BSS1")
 int
 #pragma code-name("CODE_WUT")
-main _Pragma("message(\"_Pragma note\")")
+main _Pragma
+#pragma charmap(0x61, 0x32)
+(
+"message(\"_Pragma string"
+/* Concatenated string literals in _Pragma is a cc65 extension */
+" unaffected by charmap\")"
+)
+#pragma charmap(0x61, 0x61)
 (
 void
 _Pragma _Pragma (
@@ -20,9 +50,27 @@ _Pragma _Pragma (
 #pragma bss-name("BSS2")
     static
 #pragma zpsym ("y")
-	int x; // TODO: currently in "BSS", but supposed to be in "BSS2"?
+    int x; // TODO: currently in "BSS", but supposed to be in "BSS2"?
     x = 0;
-    return x + y;
+
+    if (memcmp(str, "aBC", 3))
+    {
+        ++failures;
+        printf("%3s\n", str);
+    }
+
+    if (x + y != 0)
+    {
+        ++failures;
+        printf("%d\n", x + y);
+    }
+
+    if (failures != 0)
+    {
+        printf("faiures: %d\n", failures);
+    }
+
+    return failures;
 #pragma bss-name("BSS")
 }