Be more strict about runtime function misuse.

[maleadt]

Generates better error messages for #596:

• detects the argument count mismatch (Incorrect number of arguments for runtime function: passing 1 argument(s) to 'void () report_exception')
• in addition, refuses to generate an intrinsic call to a pre-defined function in the module (Calling an intrinsic function that clashes with an existing definition: void (i64) report_exception). This is fairly strict, but without controlling the intrinsic definition it's possible that it doesn't match the expected behavior (i.e., what probably caused GPUCompiler emit_exception has wrong number o args #596 in the first place).

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 62.78%. Comparing base (7143d02) to head (0e58cfd).
Report is 2 commits behind head on master.

Files	Patch %	Lines
src/rtlib.jl	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #603      +/-   ##
==========================================
- Coverage   66.32%   62.78%   -3.55%     
==========================================
  Files          24       24              
  Lines        3353     3509     +156     
==========================================
- Hits         2224     2203      -21     
- Misses       1129     1306     +177     

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