Compilation warnings

[amdoku]

When compiling with gcc-10.2.0 there are some warnings emitted.

The unit tests were failing when using gdb-9.2 and lldb-10.0.1 as the line would change from

error: error: use of undeclared identifier 'invalid_expr'

to

error: error: <user expression 3>:1:1: use of undeclared identifier 'invalid_expr'

This relaxes the test just enough to also work with older versions of gdb & lldb where this location information would not be included.

[codecov-commenter]

Codecov Report

Merging #374 into master will decrease coverage by 0.53%. The diff coverage is 71.42%.

@@            Coverage Diff             @@
##           master     #374      +/-   ##
==========================================
- Coverage   79.53%   79.00%   -0.54%     
==========================================
  Files          33       33              
  Lines        4744     4743       -1     
==========================================
- Hits         3773     3747      -26     
- Misses        971      996      +25     

Impacted Files	Coverage Δ
src/llscan.cc	59.41% <50.00%> (ø)
src/printer.cc	81.27% <66.66%> (+0.12%)	:arrow_up:
src/llv8.cc	71.71% <100.00%> (-2.29%)	:arrow_down:
test/plugin/scan-test.js	98.97% <100.00%> (ø)
src/llv8.h	81.81% <0.00%> (-2.28%)	:arrow_down:
src/llv8-constants.h	97.05% <0.00%> (-1.48%)	:arrow_down:
src/llv8-inl.h	90.42% <0.00%> (-0.82%)	:arrow_down:
src/llv8-constants.cc	85.92% <0.00%> (-0.76%)	:arrow_down:

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