Avoid gperf crash issue in GetStackTrace() during string allocation in generated
code, by skipping the string allocation altogether. strtoul() already skips
leading spaces, hence boost::trim() is not really necessary in this
ParseInteger() context.

Change-Id: I1ea7f6998abbabdab464922d60a8ff29b955d2cc
Merge "Avoid gperf crash issue in GetStackTrace() during string allocation in generated code, by skipping the string allocation altogether. strtoul() already skips leading spaces, hence boost::trim() is not really necessary in this ParseInteger() context." into R1.10