cmd/internal/obj/x86: cleanup comments and consts

- Unexport MaxLoopPad and LoopAlign; associated comments updated
- Remove commented-out C code
- Replace C-style /**/ code comments with single-line comments

Change-Id: I51bd92a05b4d3823757b12efd798951c9f252bd4
Reviewed-on: https://go-review.googlesource.com/104795
Run-TryBot: Iskander Sharipov <iskander.sharipov@intel.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/cmd/internal/obj/x86/a.out.go

@@ -32,8 +32,8 @@ package x86
 
 import "cmd/internal/obj"
 
+// mark flags
 const (
-	/* mark flags */
 	DONE = 1 << iota
 )
 
@@ -140,11 +140,11 @@ const (
 	REG_FS
 	REG_GS
 
-	REG_GDTR /* global descriptor table register */
-	REG_IDTR /* interrupt descriptor table register */
-	REG_LDTR /* local descriptor table register */
-	REG_MSW  /* machine status word */
-	REG_TASK /* task register */
+	REG_GDTR // global descriptor table register
+	REG_IDTR // interrupt descriptor table register
+	REG_LDTR // local descriptor table register
+	REG_MSW  // machine status word
+	REG_TASK // task register
 
 	REG_CR0
 	REG_CR1
@@ -194,9 +194,9 @@ const (
 	FREGRET  = REG_X0
 	REGSP    = REG_SP
 	REGCTXT  = REG_DX
-	REGEXT   = REG_R15     /* compiler allocates external registers R15 down */
-	FREGMIN  = REG_X0 + 5  /* first register variable */
-	FREGEXT  = REG_X0 + 15 /* first external register */
+	REGEXT   = REG_R15     // compiler allocates external registers R15 down
+	FREGMIN  = REG_X0 + 5  // first register variable
+	FREGEXT  = REG_X0 + 15 // first external register
 	T_TYPE   = 1 << 0
 	T_INDEX  = 1 << 1
 	T_OFFSET = 1 << 2

src/cmd/internal/obj/x86/list6.go

@@ -36,7 +36,7 @@ import (
 )
 
 var Register = []string{
-	"AL", /* [D_AL] */
+	"AL", // [D_AL]
 	"CL",
 	"DL",
 	"BL",
@@ -52,7 +52,7 @@ var Register = []string{
 	"R13B",
 	"R14B",
 	"R15B",
-	"AX", /* [D_AX] */
+	"AX", // [D_AX]
 	"CX",
 	"DX",
 	"BX",
@@ -72,7 +72,7 @@ var Register = []string{
 	"CH",
 	"DH",
 	"BH",
-	"F0", /* [D_F0] */
+	"F0", // [D_F0]
 	"F1",
 	"F2",
 	"F3",
@@ -120,18 +120,18 @@ var Register = []string{
 	"Y13",
 	"Y14",
 	"Y15",
-	"CS", /* [D_CS] */
+	"CS", // [D_CS]
 	"SS",
 	"DS",
 	"ES",
 	"FS",
 	"GS",
-	"GDTR", /* [D_GDTR] */
-	"IDTR", /* [D_IDTR] */
-	"LDTR", /* [D_LDTR] */
-	"MSW",  /* [D_MSW] */
-	"TASK", /* [D_TASK] */
-	"CR0",  /* [D_CR] */
+	"GDTR", // [D_GDTR]
+	"IDTR", // [D_IDTR]
+	"LDTR", // [D_LDTR]
+	"MSW",  // [D_MSW]
+	"TASK", // [D_TASK]
+	"CR0",  // [D_CR]
 	"CR1",
 	"CR2",
 	"CR3",
@@ -147,7 +147,7 @@ var Register = []string{
 	"CR13",
 	"CR14",
 	"CR15",
-	"DR0", /* [D_DR] */
+	"DR0", // [D_DR]
 	"DR1",
 	"DR2",
 	"DR3",
@@ -155,7 +155,7 @@ var Register = []string{
 	"DR5",
 	"DR6",
 	"DR7",
-	"TR0", /* [D_TR] */
+	"TR0", // [D_TR]
 	"TR1",
 	"TR2",
 	"TR3",
@@ -163,8 +163,8 @@ var Register = []string{
 	"TR5",
 	"TR6",
 	"TR7",
-	"TLS",    /* [D_TLS] */
-	"MAXREG", /* [MAXREG] */
+	"TLS",    // [D_TLS]
+	"MAXREG", // [MAXREG]
 }
 
 func init() {