Commitcc3c4af

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Fix bug in generation.c's valgrind support.

This doesn't look like the last such bug, but it's one that thetest_decoding regression test is tripping over. Per buildfarm.Tomas VondraDiscussion:https://postgr.es/m/c903f275-2150-fa52-64bf-dca7b53ebf8d@fuzzy.cz

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Original file line number	Diff line number	Diff line change
`@@ -409,9 +409,14 @@ GenerationAlloc(MemoryContext context, Size size)`
`409`	`409`
`410`	`410`	`chunk= (GenerationChunk*)block->freeptr;`
`411`	`411`
	`412`	`+/* Prepare to initialize the chunk header. */`
	`413`	`+VALGRIND_MAKE_MEM_UNDEFINED(chunk,Generation_CHUNKHDRSZ);`
	`414`	`+`
`412`	`415`	`block->nchunks+=1;`
`413`	`416`	`block->freeptr+= (Generation_CHUNKHDRSZ+chunk_size);`
`414`	`417`
	`418`	`+Assert(block->freeptr <=block->endptr);`
	`419`	`+`
`415`	`420`	`chunk->block=block;`
`416`	`421`
`417`	`422`	`chunk->context=set;`

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