Merge pull request #5264 from knutaf/patch-1

Clarify that arguments on the stack are 8-byte aligned.

Author: TylerMSFT

docs/build/x64-calling-convention.md

@@ -33,7 +33,7 @@ Prologs and epilogs are highly restricted so that they can be properly described
 
 ## Parameter passing
 
-By default, the x64 calling convention passes the first four arguments to a function in registers. The registers used for these arguments depend on the position and type of the argument. Remaining arguments get pushed on the stack in right-to-left order.
+By default, the x64 calling convention passes the first four arguments to a function in registers. The registers used for these arguments depend on the position and type of the argument. Remaining arguments get pushed on the stack in right-to-left order. All arguments passed on the stack are 8-byte aligned.
 
 Integer valued arguments in the leftmost four positions are passed in left-to-right order in RCX, RDX, R8, and R9, respectively. The fifth and higher arguments are passed on the stack as previously described. All integer arguments in registers are right-justified, so the callee can ignore the upper bits of the register and access only the portion of the register necessary.