Asm: extract section from .pushsection directive

[masatake]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 94.11765% with 1 line in your changes missing coverage. Please review.

Project coverage is 85.80%. Comparing base (ee714a4) to head (54986aa).

Files with missing lines	Patch %	Lines
parsers/asm.c	94.11%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4216   +/-   ##
=======================================
  Coverage   85.80%   85.80%           
=======================================
  Files         241      241           
  Lines       62536    62550   +14     
=======================================
+ Hits        53660    53673   +13     
- Misses       8876     8877    +1     

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[masatake]

This is unacceptable because .previous is not considered.