Describe ALLOCA.
* The subsequent operands are arguments. Their types and number and should be the same as in the prototype
* Integer arguments are truncated according to integer prototype argument type
+### MIR_ALLOCA insn
+ * Reserve memory on the stack whose size is given as the 2nd operand and assign the memory address to the 1st operand
+ * The reserved memory will be aligned according target ABI
+
## MIR API example
* The following code on C creates MIR analog of C code
`int64_t loop (int64_t arg1) {int64_t count = 0; while (count < arg1) count++; return count;}`
