runtime: fix output for bad pcHeader

With print, the output all runs together.
Take this opportunity to clean up and label all the fields.
Print pluginpath unilaterally; no reason not to.
Wrap long lines. Remove pointless newline from throw.

Change-Id: I37af15dc8fcb3dbdbc6da8bbea2c0ceaf7b5b889
Reviewed-on: https://go-review.googlesource.com/c/go/+/350734
Trust: Josh Bleecher Snyder <[email protected]>
Run-TryBot: Josh Bleecher Snyder <[email protected]>
TryBot-Result: Go Bot <[email protected]>
Reviewed-by: Cherry Mui <[email protected]>

Author: josharian

src/runtime/symtab.go

@@ -568,13 +568,11 @@ const debugPcln = false
 func moduledataverify1(datap *moduledata) {
 	// Check that the pclntab's format is valid.
 	hdr := datap.pcHeader
-	if hdr.magic != 0xfffffffa || hdr.pad1 != 0 || hdr.pad2 != 0 || hdr.minLC != sys.PCQuantum || hdr.ptrSize != goarch.PtrSize {
-		print("runtime: function symbol table header:", hex(hdr.magic), hex(hdr.pad1), hex(hdr.pad2), hex(hdr.minLC), hex(hdr.ptrSize))
-		if datap.pluginpath != "" {
-			print(", plugin:", datap.pluginpath)
-		}
-		println()
-		throw("invalid function symbol table\n")
+	if hdr.magic != 0xfffffffa || hdr.pad1 != 0 || hdr.pad2 != 0 ||
+		hdr.minLC != sys.PCQuantum || hdr.ptrSize != goarch.PtrSize {
+		println("runtime: pcHeader: magic=", hex(hdr.magic), "pad1=", hdr.pad1, "pad2=", hdr.pad2,
+			"minLC=", hdr.minLC, "ptrSize=", hdr.ptrSize, "pluginpath=", datap.pluginpath)
+		throw("invalid function symbol table")
 	}
 
 	// ftab is lookup table for function by program counter.