MSP430 Timer Interrupt Not Triggering
The manual says:

Timer_B Interrupts
Two interrupt vectors are associated with the 16-bit Timer_B module:

TBxCCR0 interrupt vector for TBxCCR0 CCIFG
TBIV interrupt vector for all other CCIFG flags and TBIFG


TIMER0_B0_VECTOR is for TB0CCR0; TIMER0_B1_VECTOR is for the other CCRs and TBIFG and is handled with TB0IV. Your CCR4 must be handled with the latter.
(And there are symbols for the vector values, something like TB0IV_TBCCR4 or TBIV__TBCCR4.)