NetBSD/src ApeR6j8lib/libnvmm libnvmm_x86.c, tests/lib/libnvmm h_mem_assist_asm.S h_mem_assist.c

   Implement XCHG, add associated tests, and add comments to explain. With
   this in place the Windows 95 installer completes successfuly.

   Part of PR/54611.
VersionDeltaFile
1.33+100-16lib/libnvmm/libnvmm_x86.c
1.8+46-1tests/lib/libnvmm/h_mem_assist_asm.S
1.14+9-1tests/lib/libnvmm/h_mem_assist.c
+155-183 files

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