cmd/ld: prepare for 64-bit ints

Use explicit IntSize constant instead of 4.

This CL does not change the meaning of int, but it should make
the eventual change of the meaning of int on amd64 a bit
smoother.

Update #2188.

R=ken, dave
CC=golang-dev
https://golang.org/cl/6554076

src/cmd/5l/l.h

@@ -37,6 +37,7 @@ enum
 {
 	thechar = '5',
 	PtrSize = 4,
+	IntSize = 4,
 	FuncAlign = 4  // single-instruction alignment
 };
 

src/cmd/6l/l.h

@@ -41,6 +41,7 @@ enum
 {
 	thechar = '6',
 	PtrSize = 8,
+	IntSize = 4,
 	
 	// Loop alignment constants:
 	// want to align loop entry to LoopAlign-byte boundary,

src/cmd/8l/l.h

@@ -41,6 +41,7 @@ enum
 {
 	thechar = '8',
 	PtrSize = 4,
+	IntSize = 4,
 	FuncAlign = 16
 };
 

src/cmd/ld/decodesym.c

@@ -138,13 +138,13 @@ decodetype_funcdotdotdot(Sym *s)
 int
 decodetype_funcincount(Sym *s)
 {
-	return decode_inuxi(s->p + CommonSize+2*PtrSize, 4);
+	return decode_inuxi(s->p + CommonSize+2*PtrSize, IntSize);
 }
 
 int
 decodetype_funcoutcount(Sym *s)
 {
-	return decode_inuxi(s->p + CommonSize+3*PtrSize + 2*4, 4);
+	return decode_inuxi(s->p + CommonSize+3*PtrSize + 2*IntSize, IntSize);
 }
 
 Sym*
@@ -163,7 +163,7 @@ decodetype_funcouttype(Sym *s, int i)
 {
 	Reloc *r;
 
-	r = decode_reloc(s, CommonSize + 2*PtrSize + 2*4);
+	r = decode_reloc(s, CommonSize + 2*PtrSize + 2*IntSize);
 	if (r == nil)
 		return nil;
 	return decode_reloc_sym(r->sym, r->add + i * PtrSize);
@@ -173,7 +173,7 @@ decodetype_funcouttype(Sym *s, int i)
 int
 decodetype_structfieldcount(Sym *s)
 {
-	return decode_inuxi(s->p + CommonSize + PtrSize, 4);
+	return decode_inuxi(s->p + CommonSize + PtrSize, IntSize);
 }
 
 enum {
@@ -186,7 +186,7 @@ decodetype_structfieldname(Sym *s, int i)
 	Reloc *r;
 
 	// go.string."foo"  0x28 / 0x40
-	s = decode_reloc_sym(s, CommonSize + PtrSize + 2*4 + i*StructFieldSize);
+	s = decode_reloc_sym(s, CommonSize + PtrSize + 2*IntSize + i*StructFieldSize);
 	if (s == nil)			// embedded structs have a nil name.
 		return nil;
 	r = decode_reloc(s, 0);		// s has a pointer to the string data at offset 0
@@ -198,18 +198,18 @@ decodetype_structfieldname(Sym *s, int i)
 Sym*
 decodetype_structfieldtype(Sym *s, int i)
 {
-	return decode_reloc_sym(s, CommonSize + PtrSize + 2*4 + i*StructFieldSize + 2*PtrSize);
+	return decode_reloc_sym(s, CommonSize + PtrSize + 2*IntSize + i*StructFieldSize + 2*PtrSize);
 }
 
 vlong
 decodetype_structfieldoffs(Sym *s, int i)
 {
-	return decode_inuxi(s->p + CommonSize + PtrSize + 2*4 + i*StructFieldSize + 4*PtrSize, 4);
+	return decode_inuxi(s->p + CommonSize + PtrSize + 2*IntSize + i*StructFieldSize + 4*PtrSize, IntSize);
 }
 
 // InterfaceTYpe.methods.len
 vlong
 decodetype_ifacemethodcount(Sym *s)
 {
-	return decode_inuxi(s->p + CommonSize + PtrSize, 4);
+	return decode_inuxi(s->p + CommonSize + PtrSize, IntSize);
 }