Add fsm_vacuum, which reduces the state array when over-allocated. #936

Job	Run time
Checkout	5s
Documentation	21s
Build NO_SANITIZER clang ubuntu DEBUG	8s
Build NO_SANITIZER clang ubuntu RELEASE	9s
Build NO_SANITIZER gcc ubuntu DEBUG	8s
Build NO_SANITIZER gcc ubuntu RELEASE	9s
Build AUSAN clang ubuntu DEBUG	9s
Build AUSAN clang ubuntu RELEASE	12s
Build AUSAN gcc ubuntu DEBUG	8s
Build AUSAN gcc ubuntu RELEASE	9s
Build MSAN clang ubuntu DEBUG	7s
Build MSAN clang ubuntu RELEASE	12s
Build MSAN gcc ubuntu DEBUG	8s
Build MSAN gcc ubuntu RELEASE	12s
Build EFENCE clang ubuntu DEBUG	7s
Build EFENCE clang ubuntu RELEASE	8s
Build EFENCE gcc ubuntu DEBUG	9s
Build EFENCE gcc ubuntu RELEASE	12s
Build FUZZER clang ubuntu DEBUG	8s
Build FUZZER clang ubuntu RELEASE	12s
Import PCRE suite	0s
Fuzz (mode ${{ matrix.mode }}) ${{ matrix.cc }} ${{ matrix.os }} ${{ matrix.debug }}	0s
Test (Sanitizers) ${{ matrix.san }} ${{ matrix.cc }} ${{ matrix.os }} ${{ matrix.debug }}	0s
Test (Makefiles) ${{ matrix.make }} ${{ matrix.os }} ${{ matrix.debug }}	0s
Test (PCRE suite) ${{ matrix.lang }} ${{ matrix.san }} ${{ matrix.cc }} ${{ matrix.os }} ${{ matrix.debug }}	0s
Install	0s
Package ${{ matrix.pkg }}	0s
	3m 13s

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