The full name of the bit is
which follows the standard naming convention XC8 uses for PIC registers.
Just "LATC4" is a short name that is also included in the device header file for those who prefer that format.
I used it to match what you used for the PORT register bit.
Personally, I always use the full name, but only once at the top of my C file where I will #define it to something more memorable.
You can find all the definitions for your device in the ,matching XC8 device specific header file.
If you have the latest copy of XC8, that is at:
C:\Program Files (x86)\Microchip\xc8\v2.05\pic\include\pic16f1503.h