runtime: rename ·main·f to ·mainPC to avoid duplicate symbol

runtime·main·f is normalized by the linker to runtime.main.f, as is
the compiler-generated symbol runtime.main·f.  Change the former to
runtime·mainPC instead.

Fixes issue #9934

Change-Id: I656a6fa6422d45385fa2cc55bd036c6affa1abfe
Reviewed-on: https://go-review.googlesource.com/8234
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/runtime/asm_386.s

@@ -114,7 +114,7 @@ ok:
 	CALL	runtime·schedinit(SB)
 
 	// create a new goroutine to start program
-	PUSHL	$runtime·main·f(SB)	// entry
+	PUSHL	$runtime·mainPC(SB)	// entry
 	PUSHL	$0	// arg size
 	CALL	runtime·newproc(SB)
 	POPL	AX
@@ -126,8 +126,8 @@ ok:
 	INT $3
 	RET
 
-DATA	runtime·main·f+0(SB)/4,$runtime·main(SB)
-GLOBL	runtime·main·f(SB),RODATA,$4
+DATA	runtime·mainPC+0(SB)/4,$runtime·main(SB)
+GLOBL	runtime·mainPC(SB),RODATA,$4
 
 TEXT runtime·breakpoint(SB),NOSPLIT,$0-0
 	INT $3

src/runtime/asm_amd64.s

@@ -109,7 +109,7 @@ ok:
 	CALL	runtime·schedinit(SB)
 
 	// create a new goroutine to start program
-	MOVQ	$runtime·main·f(SB), AX		// entry
+	MOVQ	$runtime·mainPC(SB), AX		// entry
 	PUSHQ	AX
 	PUSHQ	$0			// arg size
 	CALL	runtime·newproc(SB)
@@ -122,8 +122,8 @@ ok:
 	MOVL	$0xf1, 0xf1  // crash
 	RET
 
-DATA	runtime·main·f+0(SB)/8,$runtime·main(SB)
-GLOBL	runtime·main·f(SB),RODATA,$8
+DATA	runtime·mainPC+0(SB)/8,$runtime·main(SB)
+GLOBL	runtime·mainPC(SB),RODATA,$8
 
 TEXT runtime·breakpoint(SB),NOSPLIT,$0-0
 	BYTE	$0xcc

src/runtime/asm_amd64p32.s

@@ -73,7 +73,7 @@ ok:
 	CALL	runtime·schedinit(SB)
 
 	// create a new goroutine to start program
-	MOVL	$runtime·main·f(SB), AX	// entry
+	MOVL	$runtime·mainPC(SB), AX	// entry
 	MOVL	$0, 0(SP)
 	MOVL	AX, 4(SP)
 	CALL	runtime·newproc(SB)
@@ -84,8 +84,8 @@ ok:
 	MOVL	$0xf1, 0xf1  // crash
 	RET
 
-DATA	runtime·main·f+0(SB)/4,$runtime·main(SB)
-GLOBL	runtime·main·f(SB),RODATA,$4
+DATA	runtime·mainPC+0(SB)/4,$runtime·main(SB)
+GLOBL	runtime·mainPC(SB),RODATA,$4
 
 TEXT runtime·breakpoint(SB),NOSPLIT,$0-0
 	INT $3

src/runtime/asm_arm.s

@@ -60,7 +60,7 @@ TEXT runtime·rt0_go(SB),NOSPLIT,$-4
 	BL	runtime·schedinit(SB)
 
 	// create a new goroutine to start program
-	MOVW	$runtime·main·f(SB), R0
+	MOVW	$runtime·mainPC(SB), R0
 	MOVW.W	R0, -4(R13)
 	MOVW	$8, R0
 	MOVW.W	R0, -4(R13)
@@ -76,8 +76,8 @@ TEXT runtime·rt0_go(SB),NOSPLIT,$-4
 	MOVW	$1000, R1
 	MOVW	R0, (R1)	// fail hard
 
-DATA	runtime·main·f+0(SB)/4,$runtime·main(SB)
-GLOBL	runtime·main·f(SB),RODATA,$4
+DATA	runtime·mainPC+0(SB)/4,$runtime·main(SB)
+GLOBL	runtime·mainPC(SB),RODATA,$4
 
 TEXT runtime·breakpoint(SB),NOSPLIT,$0-0
 	// gdb won't skip this breakpoint instruction automatically,

src/runtime/asm_arm64.s

@@ -60,7 +60,7 @@ nocgo:
 	BL	runtime·schedinit(SB)
 
 	// create a new goroutine to start program
-	MOVD	$runtime·main·f(SB), R0		// entry
+	MOVD	$runtime·mainPC(SB), R0		// entry
 	MOVD	RSP, R7
 	MOVD.W	$0, -8(R7)
 	MOVD.W	R0, -8(R7)
@@ -77,8 +77,8 @@ nocgo:
 	MOVD	R0, (R0)	// boom
 	UNDEF
 
-DATA	runtime·main·f+0(SB)/8,$runtime·main(SB)
-GLOBL	runtime·main·f(SB),RODATA,$8
+DATA	runtime·mainPC+0(SB)/8,$runtime·main(SB)
+GLOBL	runtime·mainPC(SB),RODATA,$8
 
 TEXT runtime·breakpoint(SB),NOSPLIT,$-8-0
 	BRK

src/runtime/asm_ppc64x.s

@@ -69,7 +69,7 @@ nocgo:
 	BL	runtime·schedinit(SB)
 
 	// create a new goroutine to start program
-	MOVD	$runtime·main·f(SB), R3		// entry
+	MOVD	$runtime·mainPC(SB), R3		// entry
 	MOVDU	R3, -8(R1)
 	MOVDU	R0, -8(R1)
 	MOVDU	R0, -8(R1)
@@ -82,8 +82,8 @@ nocgo:
 	MOVD	R0, 1(R0)
 	RETURN
 
-DATA	runtime·main·f+0(SB)/8,$runtime·main(SB)
-GLOBL	runtime·main·f(SB),RODATA,$8
+DATA	runtime·mainPC+0(SB)/8,$runtime·main(SB)
+GLOBL	runtime·mainPC(SB),RODATA,$8
 
 TEXT runtime·breakpoint(SB),NOSPLIT,$-8-0
 	MOVD	R0, 2(R0) // TODO: TD