[dev.cc] cmd/internal/obj, cmd/internal/gc, new6g: reconvert

Reconvert using rsc.io/c2go rev 27b3f59.

Changes to converter:
 - fatal does not return, so no fallthrough after fatal in switch
 - many more function results and variables identified as bool
 - simplification of negated boolean expressions

Change-Id: I3bc67da5e46cb7ee613e230cf7e9533036cc870b
Reviewed-on: https://go-review.googlesource.com/5171
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>

src/cmd/internal/obj/link.go

@@ -280,14 +280,14 @@ type Pcdata struct {
 }
 
 type Pciter struct {
-	D       Pcdata
-	P       []byte
-	Pc      uint32
-	Nextpc  uint32
-	Pcscale uint32
-	Value   int32
-	Start   int
-	Done    int
+	d       Pcdata
+	p       []byte
+	pc      uint32
+	nextpc  uint32
+	pcscale uint32
+	value   int32
+	start   int
+	done    int
 }
 
 // An Addr is an argument to an instruction.