Reuse StringBuilder instances for nested subexpressions.
(NB StringBuilder instance for string template with a string
concatenation inside an expression entry, such as `"${"a" + "b"}"`,
will not be reused, although that doesn't seem to be a real-life issue).
#KT-18558 Fixed Target versions 1.1.4
#KT-13682 Fixed Target versions 1.1.4
Join adjacent strings literals, escaped strings, and constant values
(in a language version that supports const val inlining).
Use StringBuilder#append(char) for single-character constants
(e.g., " " in "$a $b").
#KT-17280 Fixed Target versions 1.1.4
#KT-15235 Fixed Target versions 1.1.4
Modified AsmUtil to generate calls to more specific append methods
in the StringBuilder class in order to save computation time and make
less temporary objects.
Also adds unit-test to verify that the append(Object) method was
invoked 0 times while the append(String) 3 times
Signed-off-by: Laszlo Hornyak <laszlo.hornyak@gmail.com>
