This version primarily addresses minor bugs in test code.

Bug fixes:

• Configure Solaris/Illumos to use MADV_FREE.
• Fix junk filling for mremap(2)-based huge reallocation. This is only relevant if configuring with the --enable-mremap option specified.
• Avoid compilation failure if 'restrict' C99 keyword is not supported by the compiler.
• Add a configure test for SSE2 rather than assuming it is usable on i686 systems. This fixes test compilation errors, especially on 32-bit Linux systems.
• Fix mallctl argument size mismatches (size_t vs. uint64_t) in the stats unit test.
• Fix/remove flawed alignment-related overflow tests.
• Prevent compiler optimizations that could change backtraces in the prof_accum unit test.