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Fix memory leak with lower, upper and initcap with ICU-provided collations

The leak happens in str_tolower, str_toupper and str_initcap, which areused in several places including their equivalent SQL-level functions,and can only be triggered when using an ICU-provided collation whenconverting the input string.b615920 fixed a similar leak. Backpatch down 10 where ICU collationshave been introduced.Author: Konstantin KnizhnikDiscussion:https://postgr.es/m/94c0ad0a-cbc2-e4a3-7829-2bdeaf9146db@postgrespro.ruBackpatch-through: 10

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src/backend/utils/adt
- formatting.c

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`‎src/backend/utils/adt/formatting.c‎`

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Original file line number	Diff line number	Diff line change
`@@ -1561,6 +1561,7 @@ str_tolower(const char *buff, size_t nbytes, Oid collid)`
`1561`	`1561`	`&buff_conv,buff_uchar,len_uchar);`
`1562`	`1562`	`icu_from_uchar(&result,buff_conv,len_conv);`
`1563`	`1563`	`pfree(buff_uchar);`
	`1564`	`+pfree(buff_conv);`
`1564`	`1565`	`}`
`1565`	`1566`	`else`
`1566`	`1567`	`#endif`
`@@ -1685,6 +1686,7 @@ str_toupper(const char *buff, size_t nbytes, Oid collid)`
`1685`	`1686`	`&buff_conv,buff_uchar,len_uchar);`
`1686`	`1687`	`icu_from_uchar(&result,buff_conv,len_conv);`
`1687`	`1688`	`pfree(buff_uchar);`
	`1689`	`+pfree(buff_conv);`
`1688`	`1690`	`}`
`1689`	`1691`	`else`
`1690`	`1692`	`#endif`
`@@ -1810,6 +1812,7 @@ str_initcap(const char *buff, size_t nbytes, Oid collid)`
`1810`	`1812`	`&buff_conv,buff_uchar,len_uchar);`
`1811`	`1813`	`icu_from_uchar(&result,buff_conv,len_conv);`
`1812`	`1814`	`pfree(buff_uchar);`
	`1815`	`+pfree(buff_conv);`
`1813`	`1816`	`}`
`1814`	`1817`	`else`
`1815`	`1818`	`#endif`

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Commit604d206

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`‎src/backend/utils/adt/formatting.c‎`

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