ClickHouse/contrib/libtcmalloc/README

https://github.com/gperftools/gperftools/commit/dde32f8bbc95312379f9f5a651799815bb6327c5

Several modifications:
1. Disabled TCMALLOC_AGGRESSIVE_DECOMMIT by default. It is important.
2. Using only files for tcmalloc_minimal build (./configure --enable-minimal).
3. Using some compiler flags from project.
4. Removed warning about unused variable when build with NDEBUG (by default).
5. Including config.h with relative path.
Updated tcmalloc [#METR-20000]. 2016-10-20 03:51:19 +00:00			`https://github.com/gperftools/gperftools/commit/dde32f8bbc95312379f9f5a651799815bb6327c5`
Added in-tree tcmalloc library to simplify build [#METR-20000]. 2016-05-22 00:32:13 +00:00
			`Several modifications:`
			`1. Disabled TCMALLOC_AGGRESSIVE_DECOMMIT by default. It is important.`
			`2. Using only files for tcmalloc_minimal build (./configure --enable-minimal).`
			`3. Using some compiler flags from project.`
			`4. Removed warning about unused variable when build with NDEBUG (by default).`
			`5. Including config.h with relative path.`