Always return 0-based columns from parseErrorStack

Summary:
Fixes a bug where we were skewing some stack traces by sending 1-based column numbers to the Metro symbolication endpoint, which expects them to be 0-based. This is achieved by subtracting 1 from the column numbers we find in textual stack traces, which are almost universally 1-based in current JS engines.

The bug is only noticeable in *some* cases, namely where the column immediately following the correct one is in a different function.

NOTE: The behaviour under Hermes was fixed separately, in a previous commit. This fix applies to other engines (e.g. JSC).

Changelog: [General] [Fixed] - Fix stack traces showing the wrong function name in some cases

Reviewed By: cpojer

Differential Revision: D18628230

fbshipit-source-id: 5677803500e45a41c1005496d19c150526af2d07

Author: motiz88

Libraries/Core/Devtools/parseErrorStack.js

@@ -57,7 +57,10 @@ function parseErrorStack(e: ExtendedError): Array<StackFrame> {
     ? e.stack
     : global.HermesInternal
     ? convertHermesStack(parseHermesStack(e.stack))
-    : stacktraceParser.parse(e.stack);
+    : stacktraceParser.parse(e.stack).map(frame => ({
+        ...frame,
+        column: frame.column != null ? frame.column - 1 : null,
+      }));
 
   return stack;
 }