LATX, opt: Add configurable Jcc instruction patterns

[y347812075]

Summary

• decouple instruction-pattern opcodes from runtime option bits and add strict 64-bit mask parsing and statistics
• add adjacent ADD, SAR/SHR, OR, XOR, and DEC result-to-Jcc patterns, and extend safe conditions for existing patterns
• add the OR_XX_JCC pilot across safe intermediate instructions, including EFLAGS recovery on exception paths
• keep every new pattern independently selectable and disabled by the legacy default mask

Commit series

1. LATX, refactor: Decouple instruction pattern options
2. LATX, opt: Add adjacent ADD and Jcc pattern
3. LATX, opt: Add SAR and extend SHR Jcc patterns
4. LATX, opt: Add adjacent OR and Jcc pattern
5. LATX, opt: Expand safe Jcc pattern conditions
6. LATX, opt: Add OR XX Jcc pattern
7. LATX, opt: Add adjacent XOR and Jcc pattern
8. LATX, opt: Add adjacent DEC and Jcc pattern

Validation

• release, debug, and no-pattern-check builds
• instruction-pattern option parsing, statistics, rejection, and fork semantics
• directed integration tests for all eight commits, including operand widths, flags, faults, LOCK handling, rollback, TU, unlink, and AOT paths
• git diff --check
• strict checkpatch.pl on each commit: no errors; only the generic MAINTAINERS warning caused by adding integration test files
• targeted code-generation checks show fewer host instructions for the newly enabled patterns; directed microbenchmarks show an optimization effect for each new pattern

Tracking

AgentsFlow: P-18 / T-298