[release-branch.go1.9] cmd/compile: simplify "missing function body" …

…error message

Fixes #21747.

Change-Id: I6a68370be3b7510ce364ddd1e41a1d767ce3a67f
Reviewed-on: https://go-review.googlesource.com/61311
Run-TryBot: Matthew Dempsky <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>
Reviewed-by: Robert Griesemer <[email protected]>
Reviewed-on: https://go-review.googlesource.com/70972
Run-TryBot: Russ Cox <[email protected]>
Reviewed-by: Matthew Dempsky <[email protected]>

src/cmd/compile/internal/gc/noder.go

@@ -401,7 +401,7 @@ func (p *noder) funcDecl(fun *syntax.FuncDecl) *Node {
  f.Func.Endlineno = lineno
  } else {
  if pure_go || strings.HasPrefix(f.funcname(), "init.") {
- yyerrorl(f.Pos, "missing function body for %q", f.funcname())
+ yyerrorl(f.Pos, "missing function body")
  }
  }